This is a CLASSIC example
of Münchausen's trilemma.
The Big Bang Theory Season 2, Episode 1
That's a CLASSIC
Edison move.
The Big Bang Theory Season 11, Episode 8
Of course, my fondness for CLASSIC science
fiction does draw my attention backwards...
The Big Bang Theory Season 2, Episode 22
Would you like to hear a CLASSIC
Sheldon Cooper factoid?
The Big Bang Theory Season 6, Episode 24
You've fallen victim to another one
of my CLASSIC practical jokes.
The Big Bang Theory Season 3, Episode 4